57results about How to "Stable welding process" patented technology

In an electric arc welder for creating an arc welding process between a consumable electrode advancing through a contact tip and a workpiece, the welder including a power supply to create an arc current and arc voltage and having a first lead connected to the contact tip and a second lead connected to the workpiece, the improvement comprising dividing the contact tip into an upper tip section and a lower tip section with an insulator electrically isolating the sections, a first switch selectively shiftable to a conductive state connecting one of the power supply leads to said upper tip section, a second switch selectively shiftable to a conductive state connecting the one lead to the lower tip section and a switch operating network creating a first switch signal to shift the first switch to its conductive state and/or a second switch signal to shift the second switch to its conductive state to control the effective CTWD of the arc welding process.

The invention relates to a full-automatic build-up welding machine. The full-automatic build-up welding machine provided by the invention mainly is used for solving the technical problem that the existing surfacing machine cannot finish the one-off integral soldering for three surfaces with a cyclic structure on the same workpiece clamping device. The technical scheme of the build-up welding machine has the main points that a moving framework (1) capable of longitudinally horizontal moving, a horizontal bracket (7) capable of perpendicularly moving and a horizontal sliding bracket (9) capable of transversely horizontal moving along the horizontal bracket (7) form a bracket capable of moving in three directions; a soldering gun bracket (10) is arranged on the horizontal sliding bracket (9); a soldering gun (12) connected with a soldering machine (13) is sheathed on a soldering gun holding device (11); and a positioning changing machine (17) is arranged at a position corresponding to the soldering gun (12). The full-automatic build-up welding machine provided by the invention can continuously weld multiple surfaces of a workpiece once, thereby greatly improving the production efficiency and effectively improving the technical performances of a product. The full-automatic build-up welding machine provided by the invention can be widely applied to various welding processes required to welding the multiple surfaces of the workpiece.

The invention relates to a device and a method for a water-cooling hot wire argon tungsten-arc welding of an austenitic stainless steel tube. If the sensitization and tendency of generating hot cracks are controlled only by reducing welding current and welding voltage and reducing welding hot input, the welding efficiency is reduced, and the welding characteristic of high-efficiency mechanical hot wire argon tungsten-arc welding cannot be fully played. In the method for the water-cooling hot wire argon tungsten-arc welding of the austenitic stainless steel tube, the prewelding preparation is performed first, namely the height and position of a welding gun are adjusted, an austenitic stainless steel straight tube is subjected to butt joint, and the water supply position of cooling water is adjusted; the welding gun and wires of welding equipment are protected by the same gas course; and when welding priming coats and the tube rotate to the position of 270 degrees, a cooling water valve is opened, and a welding joint is subjected to spray cooling by a spraying device until all priming coats, filling layers and covering layers are welded completely. The device and the method are used for the argon arc welding of the austenitic stainless steel tube.

The invention belongs to a gas protective welding flux cored wire for welding heat resistant steel. The gas protective welding flux cored wire comprises low-carbon steel metal skin and a flux core, wherein the low-carbon steel metal skin comprises the following components in percentage by weight: 0.01 to 0.1 percent of C, 0.1 to 0.4 percent of Mn, 0.01 to 0.03 percent of Si, 0.005 to 0.015 percent of S, 0.005 to 0.015 percent of P and the balance of iron; the flux core accounts for 14 to 25 percent of the total weight of the welding wire and comprises the following components in percentage by weight: 1.2 to 3.0 percent of medium-carbon ferromanganese, 0.20 to 2.0 percent of ferrosilicon powder, 0.05 to 0.5 percent of magnesium powder, 1.5 to 2.0 percent of metal chromium powder, 0.2 to 2.0 percent of ferromolybdenum powder, 0.05 to 0.2 percent of electrically fused magnesia, 0.01 to 0.3 percent of fluoride and 7 to 15 percent of iron powder; and the components are mixed uniformly, the mixture is coiled on a thin steel strip made of low-carbon steel to form strips, and the strips are drawn to form wires. The gas protective welding flux cored wire has the characteristics of no molten slag on deposited metal after welding, capability of performing continuous multi-layer welding without slag removal, high welding process property, stable electric arcs, small splatter, attractive appearance of weld joints and the like, the welding efficiency is improved by 20 to 40 percent, and vertical downward welding can be realized by short circuiting transfer.

The invention discloses a low-hydrogen high-tenacity self-protection flux-cored wire and a preparation method thereof and belongs to the field of metal welding materials. The low-hydrogen high-tenacity self-protection flux-cored wire is composed of low-carbon steel steel strip and a flux core, wherein the flux core is composed of the following components in percentage by mass: 45-55% of fluoride,10-20% of oxide, 2-8% of carbonate, 0.2-1.0% of sodium borate, 2-6% of metallic aluminium, 10-16% of aluminium magnesium alloy, 3-7% of metallic manganese, 5-13% of metallic nickel, 0-5% of metallic cobalt and 0.1-0.4% of metallic zirconium, and the sum of the mass percent of the components is 100%. The preparation method comprises the following steps: mixing fluoride, oxide, carbonate and sodiumborate to obtain a mixture, carrying out sintering pretreatment on the mixture, then, adding other raw materials, uniformly mixing to obtain flux core powder, adding the flux core powder in the steelstrip, and carrying out reducing, straightening, disc winding and packaging to obtain the finished product of the welding wire.

The invention discloses a corrosion-resistant flux-cored welding wire used for gas shielded welding; the flux-cored welding wire is characterized in that the chemical components and content of the alloy powder in percentage by total weight of the wire are as follows: 0.03%-0.08% of C, 0.3%-0.7% of Si, 1.1%-1.5% of Mn, less than or equal to 0.015% of S, less than or equal to 0.02% of P, 0.2%-0.5% of Cu, 0.4%-0.8% of Cr, 0.2%-0.6% of Ni, 0.03%-0.1% of Ti, 0.02%-0.10% of Sb, and the balance of iron and unavoidable impurity; and meanwhile, the ratio of Cu and Sb elements is controlled to be within the range of 4.0-8.0. The wire deposited metal and the welded have excellent mechanical property, the deposited metal has the tensile strength of more than 550MPa and has the impact toughness of more than 60J at (-40) DEG C. The gas shielded welding wire has the combination property of air-corrosion resistance and sulphuric acid dew point corrosion resistance, and meanwhile, the wire is wide in welding parameter adjustment range, stable in welding process and attractive in the formed welding line, so that the wire is beneficial to the all-position welding.

The invention is intended to provide a printed board wherein a stable soldering processing can be executed on the basis of weight distribution in the printed board, and storage as well as control can be implemented on the basis of the weight distribution, and a method of displaying the identification mark on the printed board. The weight distribution in the printed board is found on the basis of weight information and reference position information, on circuit components to be mounted on the printed board, and mount information on the circuit components. That is, on the basis of the reference position information and the mount information, the coordinates of the center positions of the respective circuit components, on the printed board, are calculated, and weights of the respective circuit components are assigned to the coordinates of center positions of the respective circuit components, thereby finding the weight distribution. Identification marks 2 to 4, indicating heavy parts in terms of the weight distribution, respectively, are displayed on the printed board.

The invention provides a low-alloy steel heat-exchange pipe butt-joint automatic welding technique. The technique comprises the following steps that a first heat exchange pipe (1) and a second heat exchange pipe (2) are assembled; welding equipment is mounted and debugged; and welding technological parameters are arranged, and welding treatment is conducted. The low-alloy steel heat-exchange pipe butt-joint automatic welding technique is free of a filling material, a tool (7) is adopted for assembly of the heat exchange pipes, and the coaxial effect is ensured; and a welding machine head and the tool (7) are matched for clamping, and the positions of a tungsten electrode and the heat exchange pipes are controlled; and according to the welding parameters and the operating requirements of the technique, the rotation center of the welding machine head drives the tungsten electrode to rotate to conduct self-melting automatic welding, the welding process is stable, the welding seam quality and welding seam forming can be effectively controlled, and the performance of a heat exchange pipe butt-joint connector meet the requirement of a product.

The invention discloses a processing method of an automobile collision box. The automobile collision box is made of a sheet metal serving as a raw material; a cantilever and a box body of the automobile collision box are formed by welding the sheet metal. The processing method of the automobile collision box comprises the following steps: (a) performing multi-station stamping processing through a progressive die to obtain each sheet metal: the cantilever, and cover plates, an upper cover and a lower cover which form the box body, wherein the upper cover and the lower cover have wavy curved surfaces and provided with flanges on both sides; (b) welding nuts on the cover plates; (c) welding the cover plates, the upper cover and the lower cover to form the box body with a cross section like a hollow square; (d) welding the box body and the cantilever. The automobile collision box processed can meet the requirements on the intensity and the impact resistance performance, and the weight cannot be increased; the procedure is simplified, the automation degree is high, and the manufacturing cost is reduced.

The invention relates to a real-time monitoring and detection method for penetration and forming during deep fusion welding for an electron beam. Based on the law of total electron beam current and back penetration beam current relationship, the monitoring and detection method forms a criterion through the research to the law to monitor the deep fusion welding for the electron beam in real time. The real-time monitoring and detection method comprises the steps: setting welding parameters such as an electron beam current Iw, etc., and conducting welding; in the welding process, collecting real-time penetration beam currents I1, I2 and Ic through a beam current sensing and collecting module; according to a penetration current ratio Ro=Ic/Iw, calculating the penetration current ratio Ro; displaying the penetration beam current Ic measured in real time and the calculated penetration current ratio Ro on a computer. Through the monitoring method, process parameters can be adjusted, therefore a high-quality weld seam is obtained, and the efficiency is improved in the mass welding process. In the process of dynamic welding, through the criterion of the penetration current ratio, the site with welding defects on a welding plate can be found in real time, but the welding defects are unable to be seen by the naked eye on the welding plate generally.

The invention relates to a chrome-nickel alloy overlaying welding process of a multipoint mooring device. The chrome-nickel alloy overlaying welding process of the multipoint mooring device is characterized by comprising the following steps of 1 performing base metal treatment before welding; 2 preheating the base metal before welding, wherein the preheating temperature is not lower than 93 DEG C; 3 selecting a welding material, namely an ENiCrMo-3 welding bar, performing drying treatment on the ENiCrMo-3 welding bar before usage and then using a heat preservation bucket to use the ENiCrMo-3 welding bar in a plug-in mode; 4 adopting a manual arc welding method to strictly enable interlayer temperature to be not higher than 165 DEG C through control, wherein welding parameters are that the current polarity is DCEP, a current range is 103-151A, a voltage range is 22-28V, the welding speed is 152-187 mm/min, and thermal input is 0.73-1.67kj/mm. The chrome-nickel alloy overlaying welding process can effectively avoid pores and cracks, ensures that chemical element contents in an overlaying layer meet the requirements, is suitable for the FPSO multipoint mooring device working in a special environment, is stable in welding process, convenient to control, good in practicability and capable of producing large economic benefit and social benefit.

A welding method for an outer metal cover and a plate body includes the following steps that A, the outer metal cover and the plate body are prepared; B, welding material coats the plate body; C, the outer cover covers the plate body, the periphery of the outer cover abuts against the welding material in a pressing mode to form a semi-finished product, and the semi-finished product is placed on a lower jig; the lower jig is provided with a wall surrounding around the plate body and the outer cover; D, the lower jig is ascended and descended to enable the semi-finished product together with the wall to enter an induction coil, and an upper jig abuts against the semi-finished product in a pressing mode; E, the induction coil generates oscillation currents at preset time and preset power, and then the periphery of the outer cover is heated to be at the temperature higher than the melting point of the welding material by 20-100 DEG C, so that the welding material is melt; F, cooling is performed until the welding material is solidified, so that welding is finished.

The invention relates to the technical field of shell part machining machines, in particular to a numerical control point welding machine used for a shell rotation reducing sheet. The numerical control point welding machine comprises a tool body base, a point welding machine driving device, a main shaft driving device, a point welding machine body and a numerical control system; and the tool bodybase is fixedly provided with the main shaft driving device, the point welding machine driving device is arranged beside the main shaft driving device and is fixedly provided with the point welding machine body, and the main shaft driving device, the point welding machine body and the point welding machine driving device are all connected with the numerical control system. According to the numerical control point welding machine, the point welding machine special for a shell casing and the rotation reducing sheet is arranged, and the welding position accuracy is guaranteed through numerical control over the main shaft driving device, the point welding machine body and the point welding machine driving device; and meanwhile, automatic welding is achieved, the welding efficiency is improved,and the welding labor force is reduced.

The invention relates to a device and method for preparing a copper-clad aluminum wire through laser welding. The device comprises a first straightening assembly, a water cooling assembly, a cladding assembly, a welding assembly, a polishing assembly, a second straightening assembly, an aluminum rod, a surface polishing and brushing assembly, a wiping assembly, a cleaning assembly, rollers, a copper plate, a continuous pulling assembly and a flaw detection assembly; the rollers are rotatably arranged on the two sides of the copper plate; the cleaning assembly, the wiping assembly and the surface polishing and brushing assembly are sequentially arranged on one sides of the rollers; the second straightening assembly and the polishing assembly are arranged on the aluminum rod; the coating assembly is arranged on the same side of the surface polishing and brushing assembly and the polishing assembly; and the welding assembly is arranged on the other side of the cladding assembly. The device is high in automation degree, and the problem of surface damage of copper-clad aluminum can be effectively solved; the welding process is stable, the weld surface and internal quality are good, and the performance is high; and the device is green, environment-friendly, pollution-free, free of interference of electric and magnetic fields and free of vacuum protection.

The invention relates to a cable welding wire narrow gap welding method, a protective gas nozzle and a welding gun, and belongs to the technical field of narrow gap welding. The narrow gap welding method comprises the following steps that the specification of a cable welding wire is selected; the cable welding wire is arranged in a welding gun with a cooling structure welding gun head; the weldinggun is connected with a welding machine, protective gas and a circulating cooling liquid tank; and the welding gun is linearly moved along the center line of a narrow gap of welding base metal. Through the narrow gap welding method provided by the invention, during welding, cooling liquid is introduced into the welding gun head, and by lowering the temperature of the welding gun head, the servicelife of a conductive rod is prolonged; and the welding gun is moved linearly along the groove center line of the welding base metal, the advantage of cable welding wire self-rotating arc is fully utilized, various high-cost sidewall fusion control technologies such as wire pendulum, wavy rotation or side seam tracking devices are not used, a layer of welding can be completed by moving the weldingwire along the center line of a narrow gap weld, and the welding production efficiency is improved.

The invention discloses a red copper laser welding device. The device comprises a control system, a laser, a laser welding head, a pre-heating mechanism and a temperature control mechanism. A laser welding mechanism comprises the laser and the laser welding head. The pre-heating mechanism comprises a heating insulation tank, insulation bricks are arranged in the heating insulation tank, and a clamp is arranged on the insulation bricks. Dry burning heating tubes are arranged on the two side walls in the heating insulation tank, and a cover plate and a pulling plate are arranged above the heating insulation tank. A motor I and a motor II are arranged on the two sides of the heating insulation tank. The motor I drives the cover plate to move along the axial direction of a tank body through the action of a gear I and a rack I. The motor II drives the pulling plate to move along the direction vertical to the axial direction of the tank body through the action of a gear II and a rack II. The laser, the motor I, the motor II, the heating insulation tank and an infrared thermometer are in line connection with the control system respectively. By means of the device, the red copper plate laser welding energy absorptivity is improved, the work efficiency is improved, weld zones are attractive, excess weld metal is absent, additional processing is not needed basically, and the process and the cost are saved.

A ball grid array type semiconductor package includes a semiconductor chip formed with bonding pads, an elastomer bonded to the semiconductor chip, a flexible wiring substrate bonded to the elastomer and formed with wirings connected at one end of the bonding pads of the semiconductor chip, a solder resist formed on the main surface of the flexible wiring substrate and solder bump electrodes connected to the other ends of the wirings. The elastomer is bonded to the flexible wiring substrate on the side of the tape, the solder resist is formed on the side of the wirings, and the solder bump electrodes are connected with the wirings by way of through holes formed in the solder resist.